Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 44 more...
- ItemWerkema407 - Two Northern Pacific GP-9 diesel locomotives on a branchline in Montana.
- ItemWerkema408 - Northern Pacific GP-9 diesel locomotive 229 and two brother GP-9s lead a freight train.
- ItemWerkema409 - Northern Pacific GP-9 diesel locomotive 300 at Livingston, Montana.
- ItemWerkema410 - Northern Pacific GP-9 diesel locomotive 329 leads a freight train at Centralia, Washington in 1965.
- ItemWerkema411 - Northern Pacific GP-9 diesel locomotive leads a freight train.
- ItemWerkema412 - Northern Pacific F-7 diesel locomotive 6015D and two B-units with a freight train on the mainline.
- ItemWerkema413 - Northern Pacific F-9 diesel locomotive 7003A enters a yard switch.
- ItemWerkema414 - Northern Pacific U-25C diesel locomotive 2523 at Tacoma, Washington, in 1968.
- ItemWerkema415 - Northern Pacific FT diesel locomotive 5400D at Portland, Oregon, in 1965.
- 2 more...